<template>
  <!-- 自定义组件-->

  <view>
      <my-search @click="gotoSearch"></my-search>
    <view class="srcoll-view-container">
      <!-- 左侧的滚动视图区域-->
      <scroll-view class="left-scroll-view" scroll-y :style="{height:wh+'px' }">
       <block v-for="(item, i) in cateList" :key="i">
         <view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>
       </block>
      </scroll-view>
      <!-- 右侧滚动视图区域-->
      <scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
      
      <view v-for="(item2,index2) in cateLevel2" :key="index2">
        <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
        <!-- 动态渲染三级分类的列表数据-->
        <view class="cate-lv3-list">
          <view class="cate-lv3-item" v-for="(item3,index3) in item2.children" :key="index3" @click="gotoGoodsList(item3)">
            <image :src="item3.cat_icon" ></image>
            <text>{{item3.cat_name}}</text>  
          </view>
        </view>
        
        
      </view>
     
      </scroll-view>
      
    </view>
   
  </view>
</template>

<script>
 import badgeMix from '@/mixins/tabbar-badge.js'
 export default {
   mixins: [badgeMix],
    data() {
      return {
        wh:0,
        //分类数据列表
        cateList:[],
        cateLevel2:[],
        //当前选中项的索引 默认选中第一项
        active :0,
        //滚动条顶部距离
        scrollTop:0
      };
    },
    onLoad() {
      //获取当前系统的信息
      const sysInfo = uni.getSystemInfoSync()
      //为wh窗口可用高度动态赋值
      this.wh = sysInfo.windowHeight - 50
      this.getCateList()
    },
    methods:{
     async getCateList(){
        const{ data:res } = await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status !==200) return uni.$showMsg()
        this.cateList =res.message
        this.cateLevel2 = res.message[0].children
      },
      activeChanged(i){
        this.active = i,
        this.cateLevel2 = this.cateList[i].children
        this.scrollTop = this.scrollTop ?0:1
      },
      gotoGoodsList(item3){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid='+item3.cat_id
        })
      },
      gotoSearch(){
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
  .srcoll-view-container {
    display: flex;
  
    .left-scroll-view {
      width: 120px;
  
      .left-scroll-view-item {
        line-height: 60px;
        background-color: #f7f7f7;
        text-align: center;
        font-size: 12px;
  
        // 激活项的样式
        &.active {
          background-color: #ffffff;
          position: relative;
  
          // 渲染激活项左侧的红色指示边线
          &::before {
            content: ' ';
            display: block;
            width: 3px;
            height: 30px;
            background-color: #c00000;
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
          }
        }
      }
    }
    .cate-lv2-title{
      font-size: 12px;
      font-weight: bold;
      text-align: center;
      padding: 15px 0;
    }
    .cate-lv3-list{
      display: flex;
      flex-wrap: wrap;
      .cate-lv3-item{
        width: 33.33%;
        margin-bottom: 10px;
        flex-direction: column;
        align-items: center;
        display: flex;
        image{
          width: 60px;
          height: 60px;
        }
        text{
          font-size: 12px;
        }
      }
    }
  
    
  }
</style>
